《《B737-Ice_and_Rain_Systems_Summary》.pdf

S BOEING 737 SYSTEMS REVIEW Page 1 ICE RAIN 1. GENERAL ° The systems provided for ice and rain protection are Thermal Anti-icing (TAI) electrical anti-icing. ° All 737 Classics pitot-static probes, 737 NG pitot probes, the Total Air Temperature probe, the 737 Classics angle of airflow sensors and 737 NG alpha vanes are electrically heated to prevent the formation of ice. Static ports are not heated. 2. COCKPIT WINDOWS ° The cockpit windows are provided with electrical heating for anti-icing and defogging. ° Heating the windows No. 1 and No. 2 also improves the impact strength of the windows for bird-strike protection. ° Air from the air-conditioning system can be used to defog the No. 1 cockpit windows. ° The windows No. 1 No. 2 consist of glass panes laminated to each side of a vinyl core. The inner glass pane is the primary load carrying member. The vinyl core also acts as a backup load carrying member. The outer pane has no structural significance but provides a scratch resistant surface. A conductive coating on the outer pane permits electrical heating to prevent ice build-up and window fogging. B737 NG : A permanent rain repellent coating is applied to the windows. ° Windows No. 3, 4 and 5 are similar in construction in that both consist of glass panes laminated to each side of a vinyl core. A conductive coating on the inner glass pane permits electrical heating to prevent fogging. Window No. 4 has an additional vinyl layer and acrylic sheet laminated to the inside surface. ° The FWD Window Heat Switches control heat to window No. 1. The SIDE Window Heat Switches control heat to windows No. 2, 3, 4 5. ° Temperature sensors, through control units, maintain windows No. 1 2 at the corr